A challenge is defined as a demand for proof or an invitation to participate in a competition.(noun)
The definition of a challenge is an act of rebellion against someone or something.(noun)
An example of challenge is an employee questioning the actions of their supervisor in a meeting.
Challenge means to stop someone and ask for their identification.(verb)
An example of challenge is someone being stopped at a border crossing to show their passport.
See challenge in Webster's New World College Dictionary
Origin: ME & OFr chalenge, accusation, claim, dispute < L calumnia, calumny
See challenge in American Heritage Dictionary 4
Origin: Middle English chalenge
Origin: , from Old French
Origin: , from Latin calumnia, trickery, false accusation; see calumny
Origin: . V., from Middle English chalengen
Origin: , from Old French chalangier
Origin: , from Latin calumniārī
Origin: , from calumnia.
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